Not sure what to think....

So I just had my transfer on Thursday....only 2 little guys survived and they were still at Morula stage. When we went into the procedure room and were able to look at them prior to them being transfered, the doctor said it looked like they had grown (one more than the other) since that morning and they were in early blastocyst stage. Everything else when great with the transfer and now just time to sit and wait...
Has anyone else experienced this?? I am hoping they just wanted the opportunity to grow inside me rather than a little dish....
Thanks!